| Niobium, Nb (Columbium, Cb); Cold-Worked | |
|---|---|
| Categories: | MetalNonferrous MetalNiobium AlloyRefractory MetalPure Element |
| Material Notes: | Cold-worked applies only to tensile and/or hardness values; other property values are typical of the element. The name niobium is used by chemists but the element is often called columbium by American metallurgists. Fabrication: good formability, work hardens slowly, cannot be soldered. Joining requires adhesives, rivets, nuts and bolts, or capacitive discharge welding. Applications: used in aerospace applications (i.e. rocket boosters), sodium vapor lamps, and superconductors. |
| Vendors: | PLANSEE SE: Whether it’s high temperatures, aggressive chemicals or extreme mechanical loading: PLANSEE supplies a suitable product solution in refractory metals or composite materials. As the world market leader in powder metallurgically produced high performance materials we combine outstanding materials knowledge with profound applications and technology know-how. Visit us at www.plansee.com.Eagle Alloys Corporation is a leading supplier of quality metals and alloys. Our staff prides itself on working fast, efficiently and courteously to get you the information you need. Call (800) 237-9012 or visit www.EagleAlloys.com.Click here to view all available suppliers for this material. Please click here if you are a supplier and would like information on how to add your listing to this material. |
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Export data to your CAD/FEA program| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 8.60 g/cc | 0.311 lb/in³ | |
| Chemical Properties | Metric | English | Comments |
| Atomic Mass | 92.90638 | 92.90638 | 1995 |
| Atomic Number | 41 | 41 | |
| Thermal Neutron Cross Section | 1.1 barns/atom | 1.1 barns/atom | |
| X-ray Absorption Edge | 0.65291 Å | 0.65291 Å | K |
| 4.59111 Å | 4.59111 Å | LI | |
| 5.02472 Å | 5.02472 Å | LII | |
| 5.22596 Å | 5.22596 Å | LIII | |
| Electrode Potential | -1.10 V | -1.10 V | |
| Electronegativity | 1.6 | 1.6 | Pauling |
| Ionic Radius | 0.690 Å | 0.690 Å | Crystal Ionic Radius for Valence +5 |
| 0.740 Å | 0.740 Å | Crystal Ionic Radius for Valence +4 | |
| 1.00 Å | 1.00 Å | Crystal Ionic Radius for Valence +1 | |
| Electrochemical Equivalent | 0.45 g/A/h | 0.45 g/A/h | |
| Mechanical Properties | Metric | English | Comments |
| Hardness, Brinell | 126 | 126 | Converted from Vickers for 3000 kg load/10 mm ball Brinell test. |
| Hardness, Rockwell A | 45 | 45 | Converted from Vickers. |
| Hardness, Rockwell B | 71 | 71 | Converted from Vickers. |
| Hardness, Vickers | 130 | 130 | |
| Tensile Strength, Ultimate | 600 MPa | 87000 psi | |
| Modulus of Elasticity | 103 GPa | 14900 ksi | |
| Poissons Ratio | 0.38 | 0.38 | |
| Shear Modulus | 37.5 GPa | 5440 ksi | |
| Electrical Properties | Metric | English | Comments |
| Electrical Resistivity | 0.0000151 ohm-cm | 0.0000151 ohm-cm | |
| Magnetic Susceptibility | 0.00000228 | 0.00000228 | cgs/g |
| Critical Magnetic Field Strength, Oersted | 2010 – 2110 | 2010 – 2110 | |
| Critical Superconducting Temperature | 9.23 – 9.27 K | 9.23 – 9.27 K | |
| Thermal Properties | Metric | English | Comments |
| Heat of Fusion | 290 J/g | 125 BTU/lb | |
| Heat of Vaporization | 7704 J/g | 3314 BTU/lb | |
CTE, linear  | 7.10 µm/m-°C @Temperature 20.0 – 100 °C | 3.94 µin/in-°F @Temperature 68.0 – 212 °F | |
| 7.38 µm/m-°C @Temperature 300 °C | 4.10 µin/in-°F @Temperature 572 °F | ||
| 7.61 µm/m-°C @Temperature 500 °C | 4.23 µin/in-°F @Temperature 932 °F | ||
| 8.52 µm/m-°C @Temperature 1000 °C | 4.73 µin/in-°F @Temperature 1830 °F | ||
| Specific Heat Capacity | 0.272 J/g-°C | 0.0650 BTU/lb-°F | |
| Thermal Conductivity | 52.3 W/m-K | 363 BTU-in/hr-ft²-°F | |
| | 52.3 W/m-K @Temperature 20.0 °C | 363 BTU-in/hr-ft²-°F @Temperature 68.0 °F | |
| 54.4 W/m-K @Temperature 100 °C | 378 BTU-in/hr-ft²-°F @Temperature 212 °F | ||
| 56.5 W/m-K @Temperature 200 °C | 392 BTU-in/hr-ft²-°F @Temperature 392 °F | ||
| 58.6 W/m-K @Temperature 300 °C | 407 BTU-in/hr-ft²-°F @Temperature 572 °F | ||
| 60.7 W/m-K @Temperature 400 °C | 421 BTU-in/hr-ft²-°F @Temperature 752 °F | ||
| 63.2 W/m-K @Temperature 500 °C | 439 BTU-in/hr-ft²-°F @Temperature 932 °F | ||
| 65.3 W/m-K @Temperature 600 °C | 453 BTU-in/hr-ft²-°F @Temperature 1110 °F | ||
| Melting Point | 2468 °C | 4474 °F | |
| Boiling Point | 4744 °C | 8571 °F | |
| Heat of Formation | 0.000 kJ/mol | 0.000 kJ/mol | Crystal |
| 725.9 kJ/mol | 725.9 kJ/mol | Gas | |
| Optical Properties | Metric | English | Comments |
| Emissivity (0-1) | 0.39 @Temperature 2000 °C | 0.39 @Temperature 3630 °F | |
| 0.78 @Temperature 1350 °C | 0.78 @Temperature 2460 °F | ||
| Component Elements Properties | Metric | English | Comments |
| Niobium, Nb (Columbium, Cb) | 100 % | 100 % | |
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